police say the blue tooth technology makes it harder to catch crooks. once they install the devices, they can nab the numbers off your card from as far away as 100 yard. and they never have to return to recover the skimmer. what's more, this universal gas pump key is making it even easier for thieves to install these new skimmers. >> police thought that they have uncovered four skimmers amount this gas station. >> more on why this gas station owner won't talk to us in a moment. but first. >> virtually indetectable. >> leading a team looking into blue tooth skimming cases from gilroy to freemont. >> in the millions. the tip of the iceberg. >> russ: in two months, police recovered skimmers and 300 victims of fraud in the bay area. how do they get inside the pump? that's where this key comes in. >> a single key would open the credit card access door to any gas pump. >> right. one key opens the majority of gas station pumps. like this one in san jose. this one in mountain view. and this onen sunnyvale. simple. thieves copy the keys and install skimmers wher